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-   -   Any High Power Darlington PA Amp Please? (http://www.diyaudio.com/forums/solid-state/219436-power-darlington-pa-amp-please.html)

Jay 10th September 2012 02:31 PM

Any High Power Darlington PA Amp Please?
 
I want to build a good amp for PA use. And it should be better than Peavey CS series. And it should be better than QUASI NBIP. My transistor box only has 12 pairs of MJ11015/16 darlington (Vce=120V).

My question is: is it uncommon to use darlington for PA amplifiers? Do I have a chance?

Lazy Cat 10th September 2012 03:27 PM

1 Attachment(s)
What about something like this? Six pairs per channel, 800 Wrms/4 ohm ;)

Osvaldo de Banfield 10th September 2012 03:31 PM

Quote:

Originally Posted by Lazy Cat (http://www.diyaudio.com/forums/solid-state/219436-power-darlington-pa-amp-please-post3159292.html#post3159292)
What about something like this? Six pairs per channel, 800 Wrms/4 ohm ;)

MUR DIODES ARE FORWARD BIASED!!!. A SHORT CIRCUITED AMP!!!

Lazy Cat 10th September 2012 03:35 PM

OK, OK too speedy drawing sch for Jay. :eek:

It is raw proposaly only, to be perfected yet. ;)

AndrewT 10th September 2012 03:41 PM

For very high power I think "ordinary" ClassAB will run too hot and/or need too much cooling.

I think one needs to look at the super power classes to help solve this "heat" problem and at the same time alleviates the temperature de-rated SOAR limitations.

Apex has shown some very high power implementations.

Michael Chua 10th September 2012 04:29 PM

Quote:

Originally Posted by Jay (http://www.diyaudio.com/forums/solid-state/219436-power-darlington-pa-amp-please-post3159217.html#post3159217)
My question is: is it uncommon to use darlington for PA amplifiers? Do I have a chance?

Yes, darlington power devices are uncommon in PA amps. You'll run into a lot of problems when you start to parallel them.

Jay 10th September 2012 07:13 PM

Quote:

Originally Posted by Lazy Cat (http://www.diyaudio.com/forums/solid-state/219436-power-darlington-pa-amp-please-post3159292.html#post3159292)
What about something like this? Six pairs per channel, 800 Wrms/4 ohm ;)

Ewww... looks like a high-end amp! :D I will try to work on this circuit thanks.

Jay 10th September 2012 07:17 PM

Quote:

Originally Posted by AndrewT (http://www.diyaudio.com/forums/solid-state/219436-power-darlington-pa-amp-please-post3159311.html#post3159311)
I think one needs to look at the super power classes to help solve this "heat" problem and at the same time alleviates the temperature de-rated SOAR limitations.

Apex has shown some very high power implementations.

Yes, but I think they aren't darlingtons.

Jay 10th September 2012 07:25 PM

Quote:

Originally Posted by Michael Chua (http://www.diyaudio.com/forums/solid-state/219436-power-darlington-pa-amp-please-post3159381.html#post3159381)
Yes, darlington power devices are uncommon in PA amps. You'll run into a lot of problems when you start to parallel them.

That's what I've heard. Regarding paralleling, I have built and seen professional stuffs with paralleled darlingtons (actually my darlingtons are taken out of one of these stuffs). But that's for low power amps. For PA, it is scary because users usually parallel 4 or more big speakers at the output.

Lazy Cat 10th September 2012 09:35 PM

Quote:

Originally Posted by Jay (http://www.diyaudio.com/forums/solid-state/219436-power-darlington-pa-amp-please-post3159591.html#post3159591)
Ewww... looks like a high-end amp! :D I will try to work on this circuit thanks.

Yeah it is just an idea to have integrated front-end in LMEs for more simplicity. Considering Vce 120Vmax for your Darlingtons, bridged amp is the only way to get some serious power output at max. +/-60 V rails potential.

Paralleling of Darlingtons can be performed if the drive current is evenly divided among all three parallel outputs and if they have app. the same hFE.

The other solution is to have separate bias setting for each Darlington pair.

But if you're determined to use Darlingtons than you'll find the proper solution too, I'm sure. :up:


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